PM2.5分布指数对线管式电除尘器除尘效率的影响

为了确定线管式静电除尘器(ESP)捕集PM2.5性能的改善途径,需探明PM2.5分布指数(分布指数)对ESP脱除细微颗粒PM2.5效率的影响规律。为此,建立了多场耦合作用下的理论模型和简化模型,分别从分级效率和综合效率的角度描述了离子风、磁约束作用下EPS对PM2.5的脱除性能。结果表明:随着颗粒粒径的减小、分布指数的降低,PM2.5分级脱除效率会显著升高;离子风的存在提高了PM2.5的脱除效率,但削弱了由降低分布指数给PM2.5脱除效率带来的提升幅度;磁场有效地提升了线管式ESP对PM2.5的捕集性能,且强化了减小分布指数对脱除PM2.5性能的促进效果。

Influences of PM2.5 Distribution Index on the Collection Efficiency of the Wire-Pipe Electrostatic Precipitator

In order to figure out the way to improve the performance of the wire-pipe electrostatic precipitator (ESP) in PM_2.5 collection, it is necessary to determine the influence law of distribution index on the collection efficiency of ESP for PM_2.5 removal of slight particles. For this purpose, the theoretical and simplified models under multi-field coupling effects were established, and the dust removal performance for PM_2.5 under ionic wind and magnetic confinement was described in terms of grade efficiency and overall efficiency respectively. The results show that as the particle size decreases or the distribution index goes down, the grade efficiency of PM_2.5 will both rise significantly. The occurrence of ionic wind improves the collection efficiency for PM_2.5, which on the other hand will offset the increase of the efficiency brought by the decrease of the distribution index unfortunately. The magnetic field not only boosts the trapping performance of wire-pipe ESP for PM_2.5 effectively, but also reinforces the promotion effect of reducing the distribution index on the dust removal performance for PM_2.5.